Rain looms as Federer, Nadal start U.S. Open campaign

NEW YORK (Reuters) - - Forecast rain threatened to disrupt day two of the U.S. Open as favorites Roger Federer and Rafa Nadal prepared to start their campaigns on Arthur Ashe on Tuesday.

FILE PHOTO: Rafa Nadal of Spain reacts after beating Fabio Fognini of Italy during their men's singles semifinal match at the China Open tennis tournament in Beijing, China, October 10, 2015. REUTERS/Kim Kyung-Hoon

World number one Nadal and Federer, who could meet in the semi-finals, will not be bothered as they are scheduled on the roof-covered center court against Dusan Lajovic and Frances Tiafoe respectively, with the Swiss closing the night session.

World number one Karolina Pliskova opens proceedings on the main showcase court against Magda Linette, of Poland, before defending champion Angelique Kerber, seeded sixth, takes on talented Japanese Naomi Osaka.

Canadian Eugenie Bouchard, who is suing the U.S. Tennis association after suffering concussion in a fall on a locker room floor last year, plays Russian Evgeniya Rodina on Grandstand.

Former champion Juan Martin Del Potro is on Louis Armstrong against Swiss Henri Laaksonen before an all-Australian clash between Nick Kyrgios and John Millman.